| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| A big hit with 1960s scientists, the CDC 1604 was one of the first computers with these instead of vacuum tubes | transistors | $600 | J | COMPUTER HISTORY | 2015-09-28 | #7136 | |
| They were invented in 1947 & by the 1990s millions were being placed on a single chip | transistors | $500 | J | 20th CENTURY INVENTION | 1998-07-16 | #3214 |